From Duke University, Durham, North Carolina.
Accepted for publication November 16, 2015.
The authors declare no conflicts of interest.
Reprints will not be available from the authors.
Address correspondence to Ashraf S. Habib, MBBCh, MSc, MHSc, FRCA, Duke University, DUMC 3094, Durham, NC 27710. Address e-mail to email@example.com.